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GB/T 18685-2017 Active
GB/T 18685-2017 The blank diameters for rolling general purpose metric screw threads
Abstract
This standard specifies the diameter dimensions of blanks before cold heading and rolling of ordinary threads. The nominal diameter range of ordinary threads is 1 mm to 52 mm (diameters of series 1 and 2; the maximum pitch is 4 mm); the thread tolerances include four grades: 4h, 6h, 6g, 6f, and 6e. This standard applies to ordinary threads made from carbon steel and alloy steel materials using the full-tooth extrusion process. Note: The "full-tooth extrusion process" refers to a processing method in which the thread material completely fills the tooth bottom space of the tool during thread extrusion forming.
General Product Information
| Document Type | National standards |
|---|---|
| Standard Status | Active |
| Standard Code | GB/T 18685-2017 |
| CCS | Basic standards and general methods |
| ICS | \nThread Composite |
| Implement Date | 2018-04-01 |
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